perf probe-event: Un-hardcode sizeof(buf)

In several places we had

  char buf[64];
  ...
  snprintf(buf, 64, ...);

This patch changes it to

  char buf[64];
  ...
  snprintf(buf, sizeof(buf), ...);

so the "64" is only stated once.
Signed-off-by: Dima Kogan <dima@secretsauce.net>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240416045533.162692-2-dima@secretsauce.netSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -236,7 +236,7 @@ static int convert_exec_to_group(const char *exec, char **result)
 		}
 	}
 
-	ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
+	ret = e_snprintf(buf, sizeof(buf), "%s_%s", PERFPROBE_GROUP, ptr1);
 	if (ret < 0)
 		goto out;
 
@@ -2867,7 +2867,7 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
 		group = PERFPROBE_GROUP;
 
 	/* Get an unused new event name */
-	ret = get_new_event_name(buf, 64, event, namelist,
+	ret = get_new_event_name(buf, sizeof(buf), event, namelist,
 				 tev->point.retprobe, allow_suffix);
 	if (ret < 0)
 		return ret;